Furnace.



E. A. BIEGHELE.

FURNAGE.

APPLIUATIONHLED No.1?, 1910.

1,025,673. Patented May '7, 1912.

NTTED sTATEs PATENT oEEioE.

EDWARD A. BIEC'HELE, OF CANTON, OHIO.

FUR'NACE.

To all whom t may concern:

Be it known that I, EDWARD A. BIECHELE, a citizen of the United States, resident of Canton, county of Stark, and State of Ohio, have invented a new and useful Improvement in Furnaces, of which the following is a specification, the principle of the invention being herein explained and the best mode in which I have contemplated applying that principle, so as to distinguish it from other inventions.

My invention relates to hot air furnaces, its object being `to provide a furnace construction which will be simple in its construction and economical in its operation.

A specific object of the inventionis to utilize to as great a degree as is possible the heat contained in the gases of combustion for heating the air.

The said invention consists of means hereinafter fully described and particularly set forth in the claims.

The annexed drawings'and the following description set fort-h in detail certain means embodying the invention, the disclosed means, however, constituting but one of various mechanical forms in which the principle of the invention may be used.

In said annexed drawing, the figure represents a vertical axial section of a furnace embodying my invention.

As illustrated, the furnace is provided with the usual outer shell A, in the interior of which is placed the combustion chamber B having the feed inlet C, and the usual grate construction D, together with the ash-pit E and usual cleaning door c therefor. The combustio-n chamber B is removed some distance from the outer shell A, so as to form the interior air-space F which surrounds the sides and top of said combustion chamber. The upper portion of the air-space is provided with the uprights f f to which the hot air pipes are connected.

Extending through an opening a in the side of the shell A is an air-duct G, which consists of the main duct portion G and a casting connection G2, which connects the part G with the upper part of the air-space F. This connection is provided with a cylindrical portion G3 and a plurality of upright elbows g g. These elbows extend through suitable openings Z) formed in the top of the combustion chamber. The horizontal portion G3 of the connecti-on consists 0f an outer portion g and an inner portion Specication of Letters Patent.

Application filed December 12, 1910.

Patented May '7, 1912. Serial No. 596,885.

g2. The outer port-ion g is fitted in an opening b formed in the side of the combustion chamber, and the inner portion g2 forms the horizontal portion of the outlet duct or smoke-pipe, for conducting away the gases of combustion. This duct g2 communicates at g3 with the interior of the combustion chamber, the inlet openings so formed being therefore located intermediately of the branches g and communicating with the spaces o2 between the upright portion of said branches. The outer end of the portion G of the -cold air duct is closed by means of a plate g4. The opening g5 forms the inlet for the cold air duct, whereby communication between the interior of same and the atmosphere is established. The lower portion of the air space F communicates with the atmosphere through an opening f',

adjacent which may be secured a cold air inlet duct A.

In operation, the gases of combustion surround the portion G2 of the cold air inlet which is located in the interior of the combustion chamber, as previously described, and thoroughly heats same. These gases rise and pass through the openings b2 between the upright branches g, thence downwardly through the opening g3, and out through the outlet duct g2 into the atmosphere. At the same time, the air in the space F is heated by its contact with the shell of the combustion chamber, and by radiation of heat therefrom. This heated air rising, causes the influx of air through the openings f and g5. The air passing through the latter opening comes into contact with the smoke pipe g2, and is heated by contact and radiation therefrom. This latter heated air passes upwardly through the branches g and into the upper portion of the air-space F. A constant circulation of air is therefore had in the cold air inlet G, and in the connection G2, together with its branches This constant circulation prevents the burning of the casting G2 in the interior of the combustion chamber, and the structure formed as above described at the same time presents a maximum heating surface to said gases of combustion while being formed in the combustion chamber, and also while being drawn upwardly through the smokepi e.

lIt will be readily understood that the portion G of the air inlet may be extended outwardly to any desired distance consistent with economy of construction, the greater such distance the longer Will the cold air be in contact with the smoke pipe, and the more heat drawn therefrom to such air.

In the above described manner, I obtain a furnace simple in its construction, and having a high degree of economy in so far as relates to the abstraction of the maximum amount of heat evolved in the combustion chamber and transmitted to the cold air drawn from the exterior.

Having fully described my invention, What I claim and desire to secure by Letters Patent is 1. In a furnace, the Combination of a combustion chamber; an outer casing surrounding said Combustion chamber and forming an air-space; a c0ld-air duct-member traversing said combustion chamber7 discharging into said air-space and having its inlet end in communication with the atmosphere; and an outlet-duct having its inner end communicating With the interior of said combustion chamber, surrounded by said coldair duct-member, of smaller diameter than the latter, so as to form an intervening airspace and passing through the inlet-end of the latter.

2. In a furnace, the combination of a combustion chamber having a side opening and a plurality of top openings; a cold-air ductinember fitted in said side opening and provided With a plurality of integral branches itted in said top openings and with an interior outlet duct having its inner end communicating with the interior of the combus tion chamber and passing outwardly through the inlet-end of the cold-air duet-member; said outletduct being formed integrally with the latter and of smaller diameter than same, so as to form an intervening air-space; an outer casing surrounding said combustion chamber; and a second duct-member connecting the inlet-end of said first-named duct-member with the atmosphere and passing through said casing.

Signed by me, this 10th day of December,

EDI/YARD A. BIECI-IELE. Attested by:

TIN IFRED VVALTZ, CURT B. MUELLER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

